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Oil reservoir flow fully-coupled pressure and production integrated numerical simulation method

A numerical simulation, fully coupled technology, applied in CAD numerical modeling, fluid production, earthwork drilling, etc., can solve the problem of inability to simulate water phase trap damage of fracturing fluids, reduce grid utilization, and ignore reservoir flow. Problems such as full coupling

Active Publication Date: 2021-07-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, this method uses unstructured grids for simulation, which reduces the grid utilization rate, and has high requirements for computing equipment, and at the same time, it cannot realize the simulation of complex cracks.
Although this method gives the idea of ​​fracturing-production process simulation, the model does not consider the full coupling of reservoir flow, does not record the pressure change history during the hydraulic fracture expansion process, and fails to integrate the fracturing process with the flowback production process. Good combination, unable to simulate fracturing fluid water phase trap damage in ultra-low water saturation reservoirs

Method used

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  • Oil reservoir flow fully-coupled pressure and production integrated numerical simulation method
  • Oil reservoir flow fully-coupled pressure and production integrated numerical simulation method
  • Oil reservoir flow fully-coupled pressure and production integrated numerical simulation method

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Embodiment

[0131] Taking an oil well (G12 well) in a block in North China as an example, the integrated numerical simulation method of pressure and production of the present invention is used to simulate fracturing, flowback, and production processes, and draw the cloud diagram of fracture propagation pressure and flowback during the simulation process. -The cloud map of reservoir pressure during production is used to visually display the simulation effect. The calculation steps for well G12 are as follows.

[0132] Step 1. Establish structured reservoir grid and fracture initial unit. First, a structured grid of the reservoir is established in the x-y rectangular coordinate system, and the simulated reservoir length L x =400m, and divided into n i =200 sections; reservoir width L y = 400m, divided into n j =200 segments, the entire reservoir is divided into a 100×100 structured grid. Then, based on the reservoir grid, the initial units of artificial fractures are established. Taki...

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Abstract

The invention relates to an oil reservoir flow full-coupling pressure and production integrated numerical simulation method. The method sequentially comprises the following steps: (1) building a structured reservoir grid and a crack initial unit; (2) calculating the half length of the artificial fracture, the width distribution of the artificial fracture, the pressure distribution of fluid in the artificial fracture, the pressure distribution of a matrix oil phase and the saturation distribution of a matrix liquid phase in the fracturing process; (3) calculating reservoir pressure distribution and reservoir water saturation distribution in the oil well flowback-production process; and (4) calculating the productivity of the oil well. According to the invention, the structured grid and the embedded discrete fracture model are adopted, the structured grid can be beneficial to processing of the oil reservoir boundary problem, and the embedded discrete fracture model has the advantages of being simple in grid division, rapid in calculation, easy to process complex fractures and the like. The invention is used for simulating fracturing, flowback and production processes of oil reservoir development, and oil well production dynamics closer to actual conditions are obtained through integrated combination, so that fracturing construction and production system design are guided.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to an integrated pressure-production numerical simulation method based on an embedded discrete fracture model with full coupling of reservoir flow. Background technique [0002] With the continuous development of oil and gas resources, numerical simulation technology has been greatly applied in the development of oil and gas fields. In the fields of hydraulic fracturing, flowback after fracturing, and oil well production, numerical simulation methods can be used to predict and analyze the construction effect and oil well productivity, thereby providing reliable guidance for actual construction and production. [0003] At present, in the numerical simulation of oil and gas reservoir development process, the numerical simulation of fracturing construction and the numerical simulation of oil well flowback production process are relatively independent, and there ...

Claims

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Application Information

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IPC IPC(8): G06F30/28E21B43/26G06F111/10G06F113/08G06F119/14
CPCG06F30/28E21B43/26G06F2111/10G06F2113/08G06F2119/14
Inventor 彭瑀骆昂李勇明常泰唐旺
Owner SOUTHWEST PETROLEUM UNIV
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